BOS to SEA from $273 in economy – flightdeals.net

Home Premium Fare Deals About

United Airlines

UAUnited Airlines

Round Trip•Economy

Logan International Airport

Boston, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$464 USD

-41%$273 USD

Verified about 5 hours ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$335 1$441 2$314 3$365 4$344 5$300 6$304 7$344 8$341 9$273 10$300 11$373 12$300 13$346 14$327 15$300 16$273 17$300 18$344 19$300 20$300 21$327 22$300 23$273 24$300 25$327 26$300 27$412 28$362 29$300 30$273 1 2 3 4

Limited Availability

10% of dates checked are available within 10% of the lowest price

Saturday, September 19th, 2026

1 round-trip options

Returning

Fri, Sep 25, 2026•6 Day Trip

$300 USD